between money events, the president attended a dedication to caesar chavez national monument. >> our world is a better place because caesar chavez decided to change it. >> reporter: with president obama and mitt romney both in ohio today, the focus is likely to shift back to the economy. >> thank you, karen. >>> all of the new numbers putting more pressure on the vice presidential candidates who debate this coming thursday night. live coverage begins at 9:00 eastern, 6:00 pacific. >>> one month of the u.s. ambassador to libya and three other americans were killed in a consulate attack in benghazi, there's word that a top white house official will visit libya today. reports say john brennan, the top white house counterterrorism adviser, will be in tripoli to meet with senior libyan officials about the investigation into the killing of ambassador chris stevens and the others. >>> and a story breaking overnight. more explosive rhetoric out of north korea this morning, warning that the united states is in striking distance of its missiles. today's remarks are in response of south korea's